No other containment procedures are necessary. > You don't need this sentence since the reader can see when the procedures end. If you want to have another sentence, you can note access requirements.

Showing File: > maybe "Displaying archive" or something. Since an SCP file is already a file, it seems weird to have a file within a file.

and to contain entities that exhibit such phenomenon. > phenomena, since "fluctuations" is plural.

as a last resort. > a bit overly dramatic and can be removed.

Its possession of a bronze heart-shaped pendant > maybe "proximity to" rather than "possession", since most people don't necessarily consider stuffed animals owning their accessories.

I feel like it might be good to have some more details about the entity. What shape did it take? What kind of aggressive behaviors did it exhibit?

Recovery > not needed. Just start immediately with the paragraph.

SCP-XXXX was discovered in the Site-82 office of a Dr. Janice Kramer > no need for the "a". Might be better to just rephrase as "discovered at Site-82, in the office of Dr. Janice Kramer…"

The convenient discovery at a Foundation site might be a bit on the difficult to believe side. Readers may be skeptical.

In addition to its pendant, a journal of a distant relative was attached as well as a note > just be straightforward. "Along with the bear, several other items were attached, including…"

is the SCP object the entity or the bear itself?

(These will be in tabs) > why? I think it'd look better in the main article. You've got the space for it.

much to Abjorn's delightfulness > just "delight"

So… it's cute I guess, but I feel like there's a fair bit missing. What is Mister Bubbles and what was his purpose? If Kramer doesn't know why they received the note and the bear to begin with, what's the connection between them and the family who had the bear? Who are Abjorn and Judith? What was Foundation interaction with the bear/entity like before it was neutralized?

I like the idea of a guardian spirit tied to a teddy bear watching over a sick child (reminds me of my friend's plush Pikachu that he brought with him to college for the flu days), but there's almost none of that in the article. Instead we get a kind of typical sad story about a sick kid, and the teddy bear is almost like an afterthought. I feel like I want to see a lot more to the story here.